[Dataflow Streaming] Reduce contention on work submission #33687
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R: @scwhittle |
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scwhittle
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Jan 21, 2025
.../worker/src/main/java/org/apache/beam/runners/dataflow/worker/util/BoundedQueueExecutor.java
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The monitor guarding BoundedQueueExecutor's counters was locked by both the work submitting threads and the harness threads (300 of them). The contention can slow down the work submission loop. This change reduces the contention by collapsing counter updates from the harness threads and letting one thread to lock the monitor and update the counters.
Example wallz profile showing the stacks locking the monitor
#33578